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0023102: Change the algorithm of rendering the 3d viewer background using tiled texture

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ouv 2012-04-13 14:58:31 +04:00
parent 046fed1ea7
commit 1e743e91ab
1 changed files with 14 additions and 4 deletions
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18
src/OpenGl/OpenGl_View_2.cxx
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@ -819,6 +819,13 @@ void OpenGl_View::Render (const Handle(OpenGl_Workspace) &AWorkspace,
}
}
// OCCT issue 0023000: Improve the way the gradient and textured
// background is managed in 3d viewer (note 0020339)
// Setting this coefficient to -1.F allows to tile textures relatively
// to the top-left corner of the view (value 1.F corresponds to the
// initial behaviour - tiling from the bottom-left corner)
GLfloat aCoef = -1.F;
glEnable( GL_TEXTURE_2D ); //push GL_ENABLE_BIT
glBindTexture( GL_TEXTURE_2D, myBgTexture.TexId ); //push GL_TEXTURE_BIT
@ -827,11 +834,14 @@ void OpenGl_View::Render (const Handle(OpenGl_Workspace) &AWorkspace,
glColor3fv( AWorkspace->BackgroundColor().rgb );
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); //push GL_TEXTURE_BIT
// Note that texture is mapped using GL_REPEAT wrapping mode so integer part
// is simply ignored, and negative multiplier is here for convenience only
// and does not result e.g. in texture mirroring
glBegin( GL_QUADS );
glTexCoord2f(0.F, 0.F); glVertex2f( -x_offset, -y_offset );
glTexCoord2f(texX_range, 0.F); glVertex2f( x_offset, -y_offset );
glTexCoord2f(texX_range, texY_range); glVertex2f( x_offset, y_offset );
glTexCoord2f(0.F, texY_range); glVertex2f( -x_offset, y_offset );
glTexCoord2f(0.F, 0.F); glVertex2f( -x_offset, -aCoef * y_offset );
glTexCoord2f(texX_range, 0.F); glVertex2f( x_offset, -aCoef * y_offset );
glTexCoord2f(texX_range, aCoef * texY_range); glVertex2f( x_offset, aCoef * y_offset );
glTexCoord2f(0.F, aCoef * texY_range); glVertex2f( -x_offset, aCoef * y_offset );
glEnd();
}